Re: Video Card Upgrade
I agree, the 6950 in this case would probably be best, as it offers the ability to work with your existing power supply. The Ti 560 should also be ok, but a lot of the ones I have seen want 550+ watts on the power supply, and yours comes with just a 500 watt. That being said however, the 6950 is a beast - a friend of mine has it and he loves it.
Welcome to CF, and no, lack of knowledge is not something to apologize for. Everyone starts somewhere.